error code P0420 and O2 sensor question
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error code P0420 and O2 sensor question
My 98' ES300 Got the P0420 agin and agin. Before blame the converter,
I'd like to try those O2's. My question is:
Could the O2 sensor still be bad enven if the resistance reading is in
the correct range?
I checked the resistance, they were correct. My es300 has 110k miles on it.
Dont know if the O2's have been replaced or not by the pre owner.
I'd like to try those O2's. My question is:
Could the O2 sensor still be bad enven if the resistance reading is in
the correct range?
I checked the resistance, they were correct. My es300 has 110k miles on it.
Dont know if the O2's have been replaced or not by the pre owner.
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Originally Posted by allerton
My 98' ES300 Got the P0420 agin and agin. Before blame the converter,
I'd like to try those O2's. My question is:
Could the O2 sensor still be bad enven if the resistance reading is in
the correct range?
I checked the resistance, they were correct. My es300 has 110k miles on it.
Dont know if the O2's have been replaced or not by the pre owner.
I'd like to try those O2's. My question is:
Could the O2 sensor still be bad enven if the resistance reading is in
the correct range?
I checked the resistance, they were correct. My es300 has 110k miles on it.
Dont know if the O2's have been replaced or not by the pre owner.
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The Voltage should read somewhere around .45v after the sensor gets over 600 degrees celcuis. The P0420 code means the catalyst systems efficency is below the standard threshold. It could mean your converter is not performaning to the factory spec, or you also could have a short in the circuit. Get your voltage for the back o2 sensor after letting the car run for a couple minutes to make sure the o2 sensor is over 600 degrees celcuis, then get the recording, if it seems normal, you probably need a new converter.
Last edited by Eclipsed; 12-18-05 at 02:08 PM.
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Originally Posted by Eclipsed
The Voltage should read somewhere around .45v after the sensor gets over 600 degrees celcuis. The P0420 code means the catalyst systems efficency is below the standard threshold. It could mean your converter is not performaning to the factory spec, or you also could have a short in the circuit. Get your voltage for the back o2 sensor after letting the car run for a couple minutes to make sure the o2 sensor is over 600 degrees celcuis, then get the recording, if it seems normal, you probably need a new converter.
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Originally Posted by koolaidman
also should be close to a flatline too
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